Intensive weight training causes micro-tears to the muscles being trained; this is generally known as microtrauma. These micro-tears in the muscle contribute to the soreness felt after exercise, called delayed onset muscle soreness (DOMS). It is the repair of these micro-traumas that results in muscle growth. Normally, this soreness becomes most apparent a day or two after a workout. However, as muscles become adapted to the exercises, soreness tends to decrease.
Hey all. I (19M) decided to start lifting to try to get a bit stronger. I'm trying to follow the "Westside for Skinny Bastards" program on this page. I'm completely new to lifting and have been trying to learn from YouTube videos. I went to the gym for the first time today, and found that I had some trouble doing the exercises with the correct form. That's not exactly surprising to me considering I'm new to all this. Also, I used weights that I found pretty light (until I get to the end of the set, when they gave me challenge), so I don't think it's the weights I'm using that threw me off.